It seems to be a common misconception even now, but Obito did not in fact have the capability of picking and choosing which parts of his body he sent to the Kamui dimension when he activated his intangibility.
Rather, when he activated the technique, his entire body became intangible and not just the parts he chose. If any object made contact with his now untouchable body while the jutsu was active, the body section was AUTOMATICALLY sent to the Kamui dimension. He did not manually remove them, they were sent away automatically.
The best example is when Obito fights Naruto, Bee, Gai and Kakashi where he attempts to teleport Naruto away but cannot because he would otherwise be taking hits from Gai's nunchucks. Another good example is when Fuu and Torume fight Obito:
You can see here that in order to avoid damage taken from the Kunai, he activates his intangibility, thus rendering him unable to proceed with his attack on Fuu. Torume even identifies the ability as doing just that the very next page.
So please don't continue to believe Obito can manually pick and choose which body parts he sends to the Kamui dimension and which he does not at will, because he cannot. If this was already obvious to you, than I apologize for wasting your time. Thanks for reading.
Rather, when he activated the technique, his entire body became intangible and not just the parts he chose. If any object made contact with his now untouchable body while the jutsu was active, the body section was AUTOMATICALLY sent to the Kamui dimension. He did not manually remove them, they were sent away automatically.
The best example is when Obito fights Naruto, Bee, Gai and Kakashi where he attempts to teleport Naruto away but cannot because he would otherwise be taking hits from Gai's nunchucks. Another good example is when Fuu and Torume fight Obito:
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You can see here that in order to avoid damage taken from the Kunai, he activates his intangibility, thus rendering him unable to proceed with his attack on Fuu. Torume even identifies the ability as doing just that the very next page.
So please don't continue to believe Obito can manually pick and choose which body parts he sends to the Kamui dimension and which he does not at will, because he cannot. If this was already obvious to you, than I apologize for wasting your time. Thanks for reading.